【摘要】：斜拉橋是由塔、梁、索三種基本部件構(gòu)成的一種組合結(jié)構(gòu)橋梁體系，屬高次超靜定的柔性結(jié)構(gòu)。隨著社會發(fā)展，人們對斜拉橋施工要求越來越高，在保證橋梁施工安全、質(zhì)量的前提下，施工進度也成了備受關(guān)注的問題。塔梁同步施工相比傳統(tǒng)的先塔后梁施工而言，在施工進度上表現(xiàn)出了明顯的優(yōu)越性。本文以重慶忠縣長江大橋為依托，對PC斜拉橋塔梁同步施工進行研究。 首先，對斜拉橋的施工階段受力特點和施工計算理論進行了討論分析，為后續(xù)數(shù)值模擬提供理論基礎(chǔ)。其次，采用韓國MIDAS公司編制的有限元軟件MIDAS/CIVIL2011建立了重慶忠縣長江大橋的空間有限元模型，對塔梁同步與先塔后梁兩種施工方案的施工過程進行了仿真計算，并從成橋索力、主梁預(yù)拱度、塔梁應(yīng)力等方面進行了斜拉橋塔梁同步施工的可行性分析。然后，在前述的基礎(chǔ)上，對索塔在塔梁同步施工期間不同荷載工況下的穩(wěn)定性做了分析，即對塔梁同步施工的可行性做了補充。最后，從影響塔梁同步施工的控制因素、控制措施、應(yīng)用范圍等方面對塔梁同步施工方法進行了探討，以保證塔梁施工的順利實施。 本文的研究成果為PC斜拉橋的同步施工提供技術(shù)支撐。同時，對同類橋梁提高施工進度和施工技術(shù)水平具有積極的意義。
[Abstract]:The cable-stayed bridge is a kind of composite structure bridge system composed of three basic components: tower, beam and cable. It belongs to the flexible structure of high order statically indeterminate structure. With the development of society, the construction requirements of cable-stayed bridges are becoming more and more high. On the premise of ensuring the safety and quality of the bridge construction, the construction schedule has become a problem of great concern. Compared with the traditional construction of tower and beam, the construction schedule of tower and beam shows obvious superiority. Based on the Yangtze River Bridge in Zhongxian, Chongqing, this paper studies the synchronous construction of tower beam of PC cable-stayed bridge. Firstly, the stress characteristics and construction calculation theory of cable-stayed bridge in construction stage are discussed and analyzed, which provides a theoretical basis for subsequent numerical simulation. Secondly, the spatial finite element model of Chongqing Zhongxian Yangtze River Bridge is established by using the finite element software MIDAS/CIVIL2011 compiled by MIDAS Company of South Korea. The construction process of the tower beam and the first tower and the rear beam are simulated and calculated, and the cable force of the bridge is obtained. The feasibility of synchronous construction of tower beam of cable-stayed bridge is analyzed in the aspects of pre-arch degree and stress of tower beam. Then, on the basis of the foregoing, the stability of the cable tower under different load conditions during the synchronous construction of the tower and beam is analyzed, that is, the feasibility of the synchronous construction of the tower and beam is supplemented. Finally, the control factors, control measures and application scope of the tower beam synchronous construction are discussed in order to ensure the smooth implementation of the tower beam construction. The research results of this paper provide technical support for synchronous construction of PC cable-stayed bridge. At the same time, it has positive significance for the similar bridges to improve the construction progress and construction technology level.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.27

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本文編號：2252067